.layout-head{
    background: white;
    height: 100%;
    display: flex;
    .select-page{
        width: 280px;
        border-right: 1px solid #ccc;
        box-sizing: content-box;
    }
    .select-device{
        padding: 0 10px;
        flex: 0 0 auto;
        line-height: 40px;
        border-right: 1px solid #ccc;
    }
}